Yup, maxibloom works killer all by it's self, except for possibly needing cal-mag.
I've used the maxibloom many times, in different setups. I still do occasionally

The absolute MAX needed is/was 1tsp/gal, usually a little less.
I get tired of dissolving it by putting it in a jug with hot water, shaking the shit out of it, before adding to rez. But, it's got to be the best bang for you buck, as far as a one part nute, unless your into miracle grow. Go for it mang